Truing mechanism for grinding machines



Aug. 23, 192.2. s. w. BATH 1, 73,530

TRUING MECHANISM FOR GRINDING MACHINES Filed March 7, 1929 3 Sheets-Sheetl Aug. 23, 1932. s w BATH 1,873,530

TRUING MECHANISM FOR GRINDING MACHINES Filed March '7, 1929 S'Sheets-Sheet 2 *YMjfM/Q Aug. 23, 1932. I s. WpBATH I TRUING MECHANISM FOR GRINDING MACHINES Filed March 7, 1929 3 Sheets-Sheet s zz/71 Bzf.

wwt Ww-M Patented Aug. 1932 UNITED STATES.

PATENT? OFFICE.

STANLEY W. BATH, bl WORCESTER, MASSACHUSETTS, ASSIGNOR' TO JOHN BATH, OI

WORCESTER, MASSACHUSETTS i TRUING MECHANISM FOR GRINDING ZhlIA(' HIlI1\'|'lES Application filed March 7,1929. Serial No. 345,112.

provide improved means for automaticall moving one or more truing devices back an forth across the edge of a grinding wheel and at a predetermined angle to the axis thereof.

To the attainment of this object, I have provided fluid-actuated mechanism by which a smooth and easy reciprocating movement may be imparted to the truing devices;

An important feature of the invention relates to the provision of means by which the 20 rate of movement of the truing devices may be conveniently adjusted.

My invention further relates to arrangements and combinations of parts which will be hereinafter. described and more particu- 25 larly pointed out in the appended claims. A preferred form of the invention is shown in the drawings in which Fig. 1 is a plan view of a portion of the grinding wheel, with my invention applied 30 thereto;

Fig. 2 isa partial rear elevation, looking in the direction of the arrow 2 in Fi 1 Fig. 3 is an enlarged elevation o certain valve mechanism, partly in section, and looking in the direction of the arrow 3 in Fig. 1; Fig. 4 is a detail sectional elevation, taken along the line 44 in Fig. 5;

1 Fig. 5 is a sectional plan view, taken along the line 5-5 in Fig. 3; i

Fig. 6 is an end elevation of certain reversing mechanism, looking in the direction of the arrow fi inFig. 3;

Fig. 7 is a sectional side elevation of the reversing mechanism, taken along the line 77 in ig. 6;

Fig. 8 is an enlarged plan view showing a portion of the grinding wheel and the truing devices associated therewith;

Fig. 9 is a view similar to Fig. 8 but showing the parts in a different position; Fig. 10 is a detail sectional elevation, taken along the line 10-10 in Fig. 8; and

Fig. 11 is an end view, partly in section, of one of the truing devices, looking in the. direction of the arrow 11 in Fig. 8.

Referring to the drawings, I have indicated a piece of work K mounted on centers and 11 supported in a tail stock 12 and head stock 13. The work is provided with a d0g'14 engaged by a driver 15 mounted on a rotating disc or plate 16. A grinding wheel W is mounted on a wheel spindle rotatable in a wheel head 21 which is adjustable forward and back relative to the work K.

The parts thus far described are of the usual design and form no part of my present invention. 3

A pair oftruing devices 2223 are mounted in slides 24 and 25 slidable on dovetailed 7o guideways 26 (Fig. 10) and closely fitted thereon by gibs 27 The truing devices 22 and 23 are each secured in the head 30 (Fig. 11) of a stud 31. The truing devices are secured in adjusted position in the heads 30 by set screws 32, and the studs 31 are secured in theslides 24 and 25 by clamping pieces 33 and clamping screws 34. Each truing device may thus be adjusted toward or from the wheel W and also may be set in any desired angular position on its respective slide.

Binding screws 35 are provided for adjusting the gibs 27 toward the dove-tailed guideways 26. The guideways 26 are formed on brackets 40, adj ustably secured on a stand or table 41, which in turn is adjustable forward and rearward on guideways 42 by an adjusting screw 43 (Fig. 1). The guideways 42 are formed on a stand or bracket .4

44, adjustably secured on a 'guideway 45 formed on the side of a wheel head 21'.

By this construction .the truing devices may be adjusted toward or away from the wheel W by means of the adjusting screw 43 and will be moved forward and rearward with the wheel W by reason of their support on the wheel head 21. v

A three-armed lever 50 is pivoted at 51 on the table 41 and is connected by a link 52 to the slide 24 and by an adjustable link 53 and rock arm 54 to the slide 25.. The

- rock arm 54 is pivoted at 55 to a bracket 56 mounted on the end of the member 40. The third arm of the lever 50 is connected by a link 57 to a stud 58 fixed in a disc 60,-

' a block or collar 67 secured on a piston rod 68.

It will be evident that as the rod 68 is reciprocated, the disc will be oscillated, causing a corresponding movement of the three-armed lever 50 and causing alternate reciprocating movements of the slides 24 and 25, these parts moving from the position shown in Fig. 8 to that shown in Fig. 9 and vice-versa.

(Jo'fltrol mechanism I will now describe the fluid actuated mechanism by which the piston rod 68 is reciprocated. I provide a tank 70 for oil or other liquid which is drawn therefrom through a pipe 71 by a pump 72, which is continuously rotated by a belt 73 on a pulley 74 or in any other convenient manner. The pump 72 is provided with a return pipe 76 controlled by a relief valve 77 and through which surplus liquid may be returned to the tank 70, if excessive pressure is built up.

. The pump 72 is also provided with a bypass or return pipe 80 and with a manually operated valve 81 by which the entire flow of the pump may be by-passed direct to the tank 70, thus interrupting the operation of the truing device slides. The pump 72 is also connected by an inlet pipe 84 to a valve and control mechanism best shown in Figs. 3 to 7.

The pipe 84 is connected through a speedcontrol valve 85 (Fig. 3) to a port 86 in the top of a valve cylinder 87 in a valve block or stand 88. A piston 90 is slidable in the cylinder 87 and is provided with spaced cylindrical portions and with reduced connecting portions providing annular fluid passages 91 and 92.

A second cylinder 95 (Fig. 3) is formed in the valve block or stand 88, in which a piston 96 on the piston rod 68 is slidable. The two ends of the cylinder 95 are connected by pipes 98 and 99 to ports 100 and 101 in the. side of the cylinder 87. Exhaust pipes An arm 110 (Fig. 3) is fixedon the piston rod 68 and is connected to a sliding rod 112 on which dogs 113 and .114 are adjustably secured. The dogs 113 and 114 engage the depending end of a member 115, pivoted at .116 and forming one member of a springactuated toggle.

A U-shaped member 120 is pivoted at 121 on a frame 122 secured by an arm 123 (Fig. 3) to the block 88; At its upper end :the

U-shaped member .120 is perforated to receive a plunger 125 having a head 126 provided with pins 127 received in openings 128 and 129 in the toggle member 115. A coil spring 130 is mounted on the plunger 125. and acts to force the plunger yieldingly downward.

A stud 132 (Fig. 6) is secured in the. side i of the U-shaped member 120 and is connected by a link 133 to a piston rod 134 on which the piston-90 is mounted. t

Operation The operation of my improved valve and control mechanism is'as follows ,7

Assuming that the parts are in the positions shown in Figs. 3 to 7 oil under pressure will flow from the inlet pipe 84 (F ig. 4') through the annular passage 91and port 101 (Fig. 5) to thepipe 99, which is connected to the right hand end of the cylinder 95 as viewed in Fig. 3.

At the same time, the pipe 98 will be connected from the left hand end of the cylinder 95 to the port 100 (Fig. 5) and through the annular passage 92 and port 104 to the exhaust pipe 102.

The piston 96 will then be moved to the left or in the direction of the arrow (1 in Fig.

1, rocking the disc 60 clockwise and moving the truing device slides in opposite directions. As the piston 96 moves to the left (Fig. 3), it carries with it the piston rod 112, eventually causing the dog 113 to engage the depending end of the toggle member 115.

The member will then be rocked in the direction of the arrow 1) in- Fig. 7, com

pressing the spring 130 until the member'115 engages a lug 140 on the U-shapedmember 120, swinging the member on its pivot until the line of action of the spring 130 passes the dead center, after which the spring 130 will expand, snapping the toggle members and the U-shaped member 120 to reverse position and moving the control piston 90 to its opposite or left hand position.

The movement of the toggle members is limited by portions of the frame member 122,

which are engaged by the member 120 at opposite sides of the center and which restrict further movement thereof.

Reversal of the piston 90 causes reverse movement of the piston 96 and eventually moves the second dog 114 into'engagement with the toggle member 115, reversing the movement in the opposite direction. The rate of movement of the piston 96 and also of the truing devices may be varied and determined by .manual setting of the valve 85.

While I have described the control mechanism as connected to a pump 72 having a bypass 80 and as being started and stopped by the valve 81 in the by-pass 80, it will be understood that the device may be entirely controlled by the valve 85, in which case any continuous fluid pressure may be provided in the pipe 84.

The mechanism above described is simple in construction, reliable in operation and very smooth and-easy inits movements and is particularly well adapted for the purposes described.

The rate of movement of the truing devices may be easily varied to meet different operating conditions by adjustably openin or closing the valve 85, which is a great advantage with certainkinds of work.

Having thus described my invention and the advantages thereof, I do not wish to bje limited to the details herein disclosed, other wise than as set forth in the claims, but what- I claim is I 1. In a grinding machine, a wheel truing? device comprising a pair of oppositely recipe" rocable truing tools, a slide for each tool, and;

means to actuate said slides simultaneously in opposite directions comprising a link pivoted to one slide, a rock arm pivoted to the other slide, and an adjustable link pivoted thereto, whereby said slides may be adjusted relative to each other, a multharmed lever pivoted on said'machine and connected to said links, a crank pivoted on said machine and a link connecting said crank to said lever and power means to actuate said crank.

2. In a grinding machine having a wheel head, a wheel truing device comprising a Q stand stand, mounted on said wheel head for movement therewith, a pair of oppositely reciprocable truing tool slides mounted for reciprocatory movement on said stand, a truing tool mounted on each of said slides and means to actuate saidslides simultaneously in opposite directions comprising a link pivoted to one slide, a rock'arin pivoted. to the other slide an adjustable link pivoted thereto, whereby said slides may be adjusted relative to each other, a multi-armed lever pivoted on said stand and connected to said links, a crank pivoted on said stand and a link connecting said crank to said lever, and power means, to actuate said crank.

3. In a grinding machine having a wheel head a wheel truing device comprising a mounted on said wheel head for movement thereon and therewith, a pair of oppositely reciprocable truing tool slides mounted for reciprocatory movement on said stand, a truing tool mounted on each of said slides and means to adjust the position of said slides relative thereto, means to adjust each tool relative to its respective slide, and means to actuate said slides simultaneously in opposite directions comprising a link pivoted to one slide, a rock arm pivoted to the other slide, an adjustable link pivoted thereto, whereby said slides may be adjusted relative to each other, a multi-armed lever pivoted on said stand and connected to said links, a crank pivoted necting said crank to said lever, and power means to actuate said crank.

4. In a grinding machine having a wheel head, a wheel truing device comprising a stand, mounted on said wheel head for movement therewith, a pair of oppositely recipro cable truing tool slides mounted for reciprocatory movement on said stand, a truing tool mounted on each of said slides and means to actuate said slides simultaneously in opposite directions comprising a linkpivoted to.

one slide, a rock arm pivoted to the other slide, an adjustable link pivoted thereto, whereby said slides may be adjusted relative to each other, a multi-armed lev'er pivoted on said stand and connected to said links, a

crank pivoted on-said stand and a link con- ;necting said crank to said lever, means to ,actuate said crank, comprislng a hydraulic motor mounted on said stand and a link connected to said crank and connected to said motor. a

5. In a grinding machine having a wheel head, a wheel truing vdevice comprising a stand mounted on said wheel head for movement thereon, a table movable relative to said stand, a pair of brackets adjustably mounted on said table, a pair of oppositely reciprocable. truing tool slides mounted for reciprocatory movement on said brackets, a truing tool mounted on each of said slides, and means to adjust the pbsition of said slides relative thereto, means to adjust each tool relative to its respective slide, and means to actuate said slides simultaneously in opposite directions comprising a link pivoted to one slide, an adjustable link pivoted to the other slide a multi-armed lever pivoted on said stand, and connected to said links, a crank pivoted on said stand and a link connecting said'crank to said lever, and powermeans to actuate said crank.

6. In a grinding machine having a wheel head, a wheel truing device comprising a stand mounted on said wheel head for movement thereon, a table movable relative to said stand,,a pair of brackets adjustably mounted on said table, a pair of oppositely reciproon said stand and a link con-' adjust the position of said slides relative thereto, means to adjust each tool relative ,to its respective slide, and means to actuate said slides simultaneously in opposite directions comprising a link pivoted to one slide, a rock arm ivoted to the other slide, and an adjustab e link pivoted thereto, whereby said slides may be adjusted relative to each other, a multi-armed lever pivoted on said stand, and connected to said links, a

' crank pivoted on said stand and a link connecting said crank to said lever, and power means to actuate said crank.

In testimony whereof I have hereunto af-. fixed my signature.

STANLEY W. BATH. 

